lock free dirstate - prototype

[Robert Collins]

On Wed, 2009-09-30 at 09:19 -0500, John Arbash Meinel wrote:
> 
> I'm pretty sure the way the code is now, we hash it whether the
> content
> has changed or not at some point.

I'm equally sure we don't.

> The #1 reason why we update the hashcache during 'status' is because
> 'bzr update' and 'bzr merge' and 'bzr commit' did *not*. We squashed
> at
> least 'bzr commit', I don't know about the rest.
> 
> The idea here is that those commands tend to change a *lot* of file 

The way we squashed commit was to change iter_changes to only hash if it
can't determine 'different'. As soon as 'different' is determined, it
won't hash. Commit feeds the stat cache; possibly revert doesn't.

Also, I have an indirection file - the 'current' pointer ;).

-Rob
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